I have a more or less finished animation. But now I saw that I want to change (slow down) some parts (objects) of my animation.
Unfortunately its not easy to change a single part (object), because then the whole animation has to be adjusted too that it matches again the changed part.
So I had the idea that it will be much easier only to increase the number of frames over the part I want to change.
Because then later if I make the video out of all my rendered frames the part with the increased number of frames is slower. (twice the number of keyframes = 0.5 speed)
Is there a possiblility to keyframe the number of frames or must I split the whole animation in parts and change the amount for each part then ? Is that a good idea, or will it cause more problems than I see now?
I tried to set a keyframe directly at the fps but that is not possible.

